Correlation of MRI-determined small bowel Crohn’s disease categories with medical response and surgical pathology

Table 1 Grouping by MRI findings

	Category 1	Category 2	Category 3	Category 4
Mucosal enhancement	Nil	Mild	Mild	Mild or marked
Transmural enhancement	Nil	Nil or mild	Nil or mild	Marked
Wall thickness (mm)	> 3	< 6	> 6	> 3

Patients were grouped on the basis of the SB wall thickness and mucosal or transmural enhancement. The 4 categories could also be described as (1) fibrosis, (2) mild segmental hyper-enhancement and mild wall thickening, (3) mild segmental hyper-enhancement and marked wall thickening, and (4) marked segmental transmural hyper-enhancement.